Route on-time record
EWR to SEA: most on-time flights and the best time to fly
Newark (Newark Liberty International Airport) to Seattle (Seattle–Tacoma International Airport). 2,179 nonstop flights in Jun 2025 to May 2026, 73% arrived within 15 minutes and 2.1% were cancelled. The most reliable flight number was United 2607 at 1:10 PM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
EWR → SEA
Newark to Seattle: 2,179 nonstop flights a year
On time (12 months)
73%
Cancelled
2.1%
avg delay 18 min
Best time to leave
9 AM to noon
86% on time vs 64% 6 to 9 PM
Most reliable airline
United
76% chance on time
Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · United 2607
1:10 PM → 4:12 PM6h 02m nonstop
Local times, typical schedule. Last flown 2026-05-18.
84%
chance on time
- On time (history)
- 100%
- Cancelled
- 0.0%
- Avg arrival delay
- 0 min
- Arrived on time 100% of the time (15 flights, Jun 2025 to May 2026).
- Departs inside EWR's trouble window: 65% of its 259 ground stops and delay programs started between 1 PM and 7 PM.
- Lands inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
- Short track record (15 flights), so its score leans on the airline's record at this hour.
Limited track record · 15 flights
Find United 2607 fares Opens this date on Aviasales#2 · United 1330
7:50 AM → 11:02 AM6h 12m nonstop
Local times, typical schedule. Last flown 2026-05-31.
80%
chance on time
- On time (history)
- 80%
- Cancelled
- 1.3%
- Avg arrival delay
- 10 min
- Arrived on time 80% of the time (299 flights, Jun 2025 to May 2026).
- Departs outside EWR's trouble window (1 PM to 7 PM, when 65% of its 259 ground stops and delay programs started).
Strong track record · 299 flights
Find United 1330 fares Opens this date on Aviasales#3 · Alaska 373
9:30 AM → 12:43 PM6h 13m nonstop
Local times, typical schedule. Last flown 2026-05-31.
79%
chance on time
- On time (history)
- 95%
- Cancelled
- 0.0%
- Avg arrival delay
- 2 min
- Arrived on time 95% of the time (19 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (9 AM to noon: 86% on time; 6 to 9 PM: 64%).
- Departs outside EWR's trouble window (1 PM to 7 PM, when 65% of its 259 ground stops and delay programs started).
- Short track record (19 flights), so its score leans on the airline's record at this hour.
Limited track record · 19 flights
Find Alaska 373 fares Opens this date on Aviasales#4 · United 1741
4:25 PM → 7:36 PM6h 11m nonstop
Local times, typical schedule. Last flown 2026-05-31.
75%
chance on time
- On time (history)
- 82%
- Cancelled
- 0.0%
- Avg arrival delay
- 18 min
- Arrived on time 82% of the time (11 flights, Jun 2025 to May 2026).
- Departs inside EWR's trouble window: 65% of its 259 ground stops and delay programs started between 1 PM and 7 PM.
- Lands inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
- 68% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 11 flights
Find United 1741 fares Opens this date on Aviasales#5 · Alaska 280
3:30 PM → 6:45 PM6h 15m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Alaska 359; its record covers all of them.
74%
chance on time
- On time (history)
- 77%
- Cancelled
- 4.2%
- Avg arrival delay
- 16 min
- Arrived on time 77% of the time (297 flights, Jun 2025 to May 2026).
- Cancelled 4.2% of the time (13 of 310).
- Departs inside EWR's trouble window: 65% of its 259 ground stops and delay programs started between 1 PM and 7 PM.
- Lands inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
Strong track record · 297 flights
Find Alaska 280 fares Opens this date on Aviasales#6 · Alaska 299
7:29 AM → 10:29 AM6h 09m nonstop
Local times, typical schedule. Last flown 2026-05-31.
72%
chance on time
- On time (history)
- 73%
- Cancelled
- 1.4%
- Avg arrival delay
- 16 min
- Arrived on time 73% of the time (278 flights, Jun 2025 to May 2026).
- Departs outside EWR's trouble window (1 PM to 7 PM, when 65% of its 259 ground stops and delay programs started).
Strong track record · 278 flights
Find Alaska 299 fares Opens this date on Aviasales#7 · Alaska 247
5:56 PM → 9:10 PM6h 14m nonstop
Local times, typical schedule. Last flown 2026-05-12.
69%
chance on time
- On time (history)
- 95%
- Cancelled
- 5.0%
- Avg arrival delay
- 2 min
- Arrived on time 95% of the time (19 flights, Jun 2025 to May 2026).
- Departs inside EWR's trouble window: 65% of its 259 ground stops and delay programs started between 1 PM and 7 PM.
- Lands inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
- Short track record (19 flights), so its score leans on the airline's record at this hour.
Limited track record · 19 flights
Find Alaska 247 fares Opens this date on Aviasales#8 · Alaska 462
9:00 AM → 12:11 PM6h 14m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Alaska 1474; its record covers all of them.
66%
chance on time
- On time (history)
- 67%
- Cancelled
- 2.8%
- Avg arrival delay
- 29 min
- Arrived on time 67% of the time (347 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (9 AM to noon: 86% on time; 6 to 9 PM: 64%).
- Departs outside EWR's trouble window (1 PM to 7 PM, when 65% of its 259 ground stops and delay programs started).
Strong track record · 347 flights
Find Alaska 462 fares Opens this date on Aviasales#9 · United 1796
8:30 PM → 11:44 PM6h 14m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 2044; its record covers all of them.
66%
chance on time
- On time (history)
- 66%
- Cancelled
- 1.9%
- Avg arrival delay
- 24 min
- Arrived on time 66% of the time (254 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (6 to 9 PM: 64% on time; 9 AM to noon: 86%).
- Departs outside EWR's trouble window (1 PM to 7 PM, when 65% of its 259 ground stops and delay programs started).
Strong track record · 254 flights
Find United 1796 fares Opens this date on Aviasales#10 · Alaska 357
5:00 PM → 8:13 PM6h 13m nonstop
Local times, typical schedule. Last flown 2026-04-21.
62%
chance on time
- On time (history)
- 66%
- Cancelled
- 0.0%
- Avg arrival delay
- 19 min
- Arrived on time 66% of the time (35 flights, Jun 2025 to May 2026).
- Never cancelled in 35 scheduled flights.
- Departs inside EWR's trouble window: 65% of its 259 ground stops and delay programs started between 1 PM and 7 PM.
- Lands inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
Limited track record · 35 flights
Find Alaska 357 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines76%
972 flights · 77% on time as flown · 1.2% cancel
- Alaska Airlines68%
1,207 flights · 70% on time as flown · 2.8% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM78%
619 flights · avg delay 12 min
- 9 AM to noon86%
216 flights · avg delay 9 min
- 3 to 6 PM72%
697 flights · avg delay 23 min
- 6 to 9 PM64%
595 flights · avg delay 22 min
Best day: Tuesday (80%). Worst: Friday (71%).
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Air traffic control and airport volume38%
- Late-arriving aircraft35%
- Airline (crew, maintenance, boarding)18%
- Severe weather8%
- Security1%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
EWR to SEA questions
- What time of day is best to fly EWR to SEA?
- 9 AM to noon: 86% of flights arrived on time, against 64% for departures 6 to 9 PM.
- Which airline is most on time from EWR to SEA?
- United, with a season-adjusted 76% chance of operating and arriving on time over 972 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on EWR to SEA?
- July (57% on time); the best was September (83%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from EWR
- SEA to EWR (return)
- EWR to MCO 76%
- EWR to ATL 77%
- EWR to ORD 71%
- EWR to LAX 72%
- EWR to FLL 75%
- EWR to SFO 71%
- EWR to MIA 77%
- EWR to BOS 71%
- EWR to CLT 80%
- EWR to IAH 79%
- EWR to DTW 79%
- EWR to PBI 77%
Live status: FAA delays and ground stops